Twisting and forming device for pneumatic and mechanical spinning



March 17, 1970 L. J. POLYAKOVSKY E AL 3,500,624

TWISTING AND FORMING DEVICE FOR PNEUMATIC AND MECHANICAL SPINNING Filed April 25. 1968 United States Patent 3,500,624 TWISTING AND FORMING DEVICE FOR PNEU- MATIC AND MECHANICAL SPINNING Lev Judelevich Polyakovsky, 13 Parkovaya ulitsa, 27, kmpus 4, kv. 51; Igor Vladimirovich Kornev, Pogodinskaya ulitsa, 14/16, kv. 28; Lidia Petrovna Kovaeva, Varshavskoe shosse, 9/1, kv. 40; and Stanislav Markovich Balandin, Nikolo-Yamsky pereulok, 4/6, kv. 64, all of Moscow, U.S.S.R.

Filed Apr. 25, 1968, Ser. No. 724,165 Int. Cl. D01h 7/68 US. Cl. 57129 4 Claims ABSTRACT OF THE DISCLOSURE A twisting and forming device is provided for pneumatic and mechanical spinning and comprises a driving spindle supporting a cup for yarn formation at one end and having a cone at the other end which rests on a flat journal of antifriction graphite so as to form a thrust hearing at this end. The spindle is supported for rotation by a plurality of radial sliding friction bearings with an air cushion, the hearings in turn being mounted in elastic dampers.

This invention relates to textile machines for pneumatic and mechanical spinning and more particularly to twisting and forming devices for these machines.

Already known are twisting and forming device comprising a cup for yarn formation fixed on a driving rotor which turns in radial sliding friction bearings with an air cushion and rests on a thrust bearing.

In twisting and forming devices known heretofore rotor vibration is eliminated by compressed air supplied at a pressure of 2-4 atm. through a system of grooves into the radial air cushion bearings. Air is supplied at the same pressure into the thrust bearing where it forms an air cushion between the journal and the thrust bearing thus reducing to a minimum the friction between them in rotation.

However the supply of compressed air at high pressure necessitates the use of special arrangements requiring high power consumption while interruptions in air supply inevitably result in breakdowns.

An object of the present invention is the provision of a twisting and forming device for pneumatic and mechanical spinning in which rotor (spindle) vibrations are eliminated and the friction between the journal and thrust bearing is materially reduced without using compressed air at high pressure.

In connection with the above mentioned and other objects of the invention, in the twisting and forming device comprising a cup for yarn formation fixed on the driving spindle rotating in radial sliding friction bearings with an air cushion and resting on a thrust bearing, according to the invention the radial friction bearings are mounted in elastic dampers, while the thrust bearing is formed by the cone at the end of the spindle and the flat journal preferably made of antifriction graphite.

The most efficient solution of the problem is to make the elastic damper of at least one ring and the fiat journal of a disc fitted into a shell eccentrically disposed relative the spindle center line.

The use of this invention will increase the spinning speed on a pneumatic mechanical spinning machine up to "ice 30,000-40,000 r.p.m. and higher, with better stability longer service life and noiseless operation of the twisting and forming device which is brought into action by a tape commonly used in usual ring spinning frames.

Other objects and advantages of this invention will be made more clear by the description of an embodimen with reference to the appended drawing diagrammatically illustrating the twisting and forming device in longitudinai cross-section.

The twisting and forming device is composed of 2 yarn forming cup 1 fixed on a spindle 2. The latter rotate: in radial sliding friction bearings 4 with an air cushior and rests upon a thrust bearing. The spindle is driver by means of tape 3 or a belt.

The radial sliding friction bearings 4 with an air cushior are mounted in annular elastic dampers '5 which in turr are fixed in the body 6. A cutout is provided in the bod 6 for the driving belt or tape.

The thrust bearing-is formed by the cone 7 at the end of spindle 2 and the flat thrust journal 8.

The flat journal 8 is made of antifriction graphite in the shape of a disk fitted in the shell 9.

The shell 9 is eccentrically disposed relative the center line of spindle 2 in a socket 10 attached to the body 6.

The shell is provided with a handle 11 for turning it in the socket 10.

The body 6 is fixed on the machine stand by means 0: elastic damper 12 ensuring additional damping of vibra tions, especially at high speeds. This allows a furthe1 increase in the rotation speed of the twisting and form ing device.

The twisting and forming device operates in the fol lowing way:

As the spindle 2 comes in contact with the moving tape 3 or the belt it starts rotating.

In the radial sliding friction bearings 4 with an ai1 cushion, a zone of excessive air pressure is created, a: a result of which an air gap is formed between the spindle 2 and bearing 4 along the full length of the bearing anc' the spindle 2 is centered by the action of aerodynamic forces. When the spindle 2 oscillates, it presses througl an air film (up to l2'kgs./force for 10 microns of the displacement of spindle 2 in the gap of the radial sliding friction bearing 4 with air cushion) upon the walls .01 bearings 4 and further on the elastic dampers 5 having a much lower rigidity. Thus, the vibration energy oi spindle 2 is absorbed by the material of the elastic dampers and the spindle vibrations are damped.

Considering that the losses due to friction in the journal are low since the linear speed of the spindle cont point is small, the wear of journal 8 is inconsiderable After the flat journal 8 has been worn at one point it is turned by means of the shell with handle 11 through a certain angle and fixed with a set screw in the new position. The length of the graphite bearing circumference is such that it accommodates 8-10 working points for the consecutive operation of the conical journal.

What is claimed is:

1. Twisting and forming device for pneumatic and mechanical spinning comprising a cup for yarn formation; a driving spindle having opposite ends and supporting said cup at one of said ends; a plurality of radial sliding friction bearings with an air cushion, said spindle being rotatably supported in said bearings; elastic dampers in which the radial sliding friction bearings are mounted; and a thrust bearing constituted by a cone at the other end of said spindle and a flat journal of antifriction graphite in contact with said cone.

' 4 2. A twisting and forming device according to claim 1 2,068,652 1/ 1937 Brull 308-228 'herein each elastic damper comprises at least one ring. 2 573 1 Winslow 57 39 3. A twisting and forming device according to claim 1 'herein said flat journal is a disk, the device further 2668087 2/1954 Sousslofi et 57 130 XR omprising a shell eccentrically disposed relative to the 2,959,908 11/1960 Neal 57 134 pindle and receiving said disk. 5 3,100,375 8/1963 Bourgeas 57--134 4. A twisting and forming device according to claim 3 3,100,960 8/ 1963 Pavlovich 57130 herein said shell is rotatably adjustable to vary the 10- ation of contact of the disk with said cone. STANLEY N. GILREATH, Primary Examiner References Cited 10 W. H. SCHROEDER, Assistant Examiner UNITED STATES PATENTS US. Cl. X.R.

137,443 4/ 187-3 Henry 308-456 g 152, 727,255 5/1903 Ashworth 308156 

